Fix LocalStack authentication by reading AWS credentials from environment variables

Author: NinjaRocks

tests/SourceFlow.Cloud.AWS.Tests/TestHelpers/AwsTestConfiguration.cs

@@ -29,13 +29,17 @@ public class AwsTestConfiguration
 
     /// <summary>
     /// AWS access key for testing (used with LocalStack)
+    /// LocalStack accepts any credentials when IAM is not enforced,
+    /// but 'test' is the standard convention
     /// </summary>
-    public string AccessKey { get; set; } = "test";
+    public string AccessKey { get; set; } = Environment.GetEnvironmentVariable("AWS_ACCESS_KEY_ID") ?? "test";
 
     /// <summary>
     /// AWS secret key for testing (used with LocalStack)
+    /// LocalStack accepts any credentials when IAM is not enforced,
+    /// but 'test' is the standard convention
     /// </summary>
-    public string SecretKey { get; set; } = "test";
+    public string SecretKey { get; set; } = Environment.GetEnvironmentVariable("AWS_SECRET_ACCESS_KEY") ?? "test";
 
     /// <summary>
     /// Test queue URLs mapped by command type